Walpole Reservoir Dam
Key Takeaway
Walpole Reservoir Dam is classified as high hazard in New Hampshire. It was completed in 1901 and is 125 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 20 ft (taller than 70.9% in NH) |
| Dam Length | 355 ft |
| Dam Type | Earth |
| Max Storage | 16 acre-ft |
| Normal Storage | 5 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 642 cfs |
| Year Completed | 1901 (125 years old) |
| Year Modified | 2003 |
| NID ID | NH01100 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
TOWN OF WALPOLE
Local Government
Nearby Dams
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Significant Hazard 31 ftWarren Lake Dam
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High Hazard 13 ftChes Cnty Ww Lagoon Dam
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Significant Hazard 20 ftCranberry Pond Dam
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Low Hazard 11 ftSurry Mountain Dam
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High Hazard 83 ftFrequently Asked Questions
What is the hazard classification of Walpole Reservoir Dam?
Walpole Reservoir Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Walpole Reservoir Dam?
Walpole Reservoir Dam is owned by TOWN OF WALPOLE (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Walpole Reservoir Dam built?
Walpole Reservoir Dam was completed in 1901, making it 125 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Walpole Reservoir Dam?
Walpole Reservoir Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Walpole Reservoir Dam?
Walpole Reservoir Dam has a dam height of 20 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Walpole Reservoir Dam last inspected?
Walpole Reservoir Dam was last inspected on September 23, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.